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3.5.1 Understanding the Proprietary ISDN MIB Module
The proprietary ISDN MIB module provides management stations with an interface to review ISDN B- and D-channels, monitor their status, and report fault conditions using SNMP traps.
The ISDN MIB module contains the following tables and traps:
3.5.1.1 D-Channel Table (dlgIsdnSigTable)
The D-Channel table contains an entry for each D-channel for all ISDN-configured Intel Dialogic and Intel NetStructure boards. Primary Rate Interface (PRI) devices may have zero or one D-channel configured. If NFAS is not being used, then the D-Channel table contains one entry per trunk line, corresponding to each D-channel needed to provide control signals for each interface. If NFAS is configured, then the D-Channel table will contain fewer entries corresponding to the shared D-channel among multiple interfaces. The D-Channel table contains the following columns described in this section.
- D-Channel Index (dlgIsdnSigIndex)
- This column contains the table indices.
- D-channel Name (dlgIsdnSigName)
- This column contains the names of the D-channels using the Intel Dialogic R4 convention for naming devices. For PRI devices, the R4 names are dtiBx, where x is a positive integer.
- ISDN Protocol (dlgIsdnSigProtocol)
- The ISDN protocol used by each D-channel is stored in this column. For instance, 4ess, 5ess, and NTI are possible values for this column.
- B-channel Count (dlgIsdnSigBchanCount)
- This column contains the number of B-channels whose control signaling is performed by each D-channel.
- Primary Channel Indicator (dlgIsdnSigPrimary)
- When this boolean-typed column indicates true for an entry, then the corresponding D-channel is considered to be the primary ISDN D-channel for the managed node.
- LAPD Operational Status (dlgIsdnSigLapdOperStatus)
- Each D-channel may indicate a link-up or link-down status depending on the Layer-2 connection state of the LAPD layer. This column contains this state for each D-channel, and each entry contains one of the following three values:
- Board Index (dlgIsdnSigHiIdentIndex)
- Each entry in this column contains an index into the Board Identification Table (dlgHiIdentTable) that indicates on which board its corresponding D-channel resides.
3.5.1.2 Bearer Channel Table (dlgIsdnBearerTable)
The Bearer Channel (B-channel) table contains one entry for each B-channel on every Intel Dialogic and Intel NetStructure -based ISDN board that is configured and started. This table allows the user to monitor the call state of each B-channel and to also trace a B-channel to its corresponding D-channel and its board or residence.
- Bearer Channel Index (dlgIsdnBearerIndex)
- This column contains the table indices.
- Bearer Channel Name (dlgIsdnBearerName)
- This column contains the name of each B-channel. This name is based on the Intel Dialogic convention for naming logical R4 devices. It has the form dtiBxTy, where x is the logical Intel Dialogic Springware board number and y is the time slot number of the B-channel.
- Bearer Channel Status (dlgIsdnBearerStatus)
- This column indicates the operational status for each B-channel. The possible values for B-channel status are:
- Note: Do not use a
seton the the dlgIsdnBearerStatus OID.- D-Channel Index
- Each B-channel has an associated D-channel listed in the D-Channel table (section 1.1). The indices in this table refer to the indexed entries in the D-Channel table and can be used to trace each B-channel over to its associated D-channel.
- Board Index
- Each entry in this column contains an index into the Board Identification Table (dlgHiIdentTable) that indicates on which board its corresponding B-channel resides.
3.5.1.3 ISDN Traps
ISDN traps provide information on fault conditions.
- D-Channel Status Change (dlgIsdnDChanged)
- This trap is generated anytime the LAPD status of a D-channel changes value. The trap contains the following variables and associated current values:
- Bearer Channel Status Change (dlgIsdnBChanged)
- This trap is generated anytime the operational status of a B-channel changes value. The trap contains the following variables and associate current values:
- Note: B Channel traps are not generated on Intel NetStructure boards because this could cause too many traps to be sent.
3.5.1.4 A Typical ISDN Configuration
The following tables show a typical managed node's ISDN tables:
The first table shows four trunk lines configured with R4 virtual board device names dtiB1, dtiB2, dtiB5, and dtiB6. Each one has a D-channel configured; hence, there are four entries in the D-Channel table. The first D-channel is indicating a link-down status, which may indicate a potential fault on the trunk line. The potentially faulty trunk may be further diagnosed by referring to the DS-1 Alarm table and the DS-1 Configuration table for more detailed signal-level information. The first table also shows that the first two ISDN interfaces are configured on the board with index 1 in the Board Identification Table, and the second two interfaces are found at index 2 in the Board Identification Table.
The Bearer Channel table shown above provides greater depth of information regarding individual B-channels, each of which may be carrying voice data for a call conversation. From the table, it is obvious that the B-channels associated with the potentially faulty trunk line are out-of-service (indices 1-4 and beyond). The interfaces for the operational ISDN interfaces have been configured and they indicate this status in the entries 47, 48, and beyond.
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